- Sizes: * XS - (3 - 5) UK * S - (5 - 7) UK * M - (7 - 9) UK * L - (9 - 11) UK * XL - (11 - 13) UK When it comes to affordability and durability, this Alder Rocket Pro Bodyboard Fins are great for you! It is similar in shape and construction to the Churchill Makapuu (Top End) only much cheaper but still with the soft foot pocket and ridget outer fin to give paddle power.